This article has been added 5 days ago [1], in case anyone is wondering how recent it is. [1]: https://github.com/google/WebFundamentals/commits/master/src/con

This article has been added 5 days ago [1], in case anyone is wondering how recent it is. [1]: https://github.com/google/WebFundamentals/commits/master/src/content/en/fundamentals/architecture/building-components/customelements.md https://github.com/google/WebFundamentals/commits/master/src...